Making it richer
Use a 190g jar of tuna in olive oil, reserving 1 tbsp of the oil to drizzle over the pizza when you add the fish.
Making it veggie
Replace tuna with marinated artichokes or chargrilled peppers or aubergines from a jar or the deli counter.
Heat oven to 230C/fan 210C/gas 8. Spread the pizza base with tomato purée. Scatter over the garlic, olives, tomatoes and half the oil. Bake for 10 mins until the tomatoes start to colour and the base is crisp.
Remove from the oven, sprinkle over the capers, tuna and basil, drizzle with oil, then serve.